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Nemo Tensor Ultralight vs Sea to Summit Spark Pro Down Sleeping Bag

Weight and specs compared for 2026 — and which one to choose.

Nemo Tensor Ultralight is the lighter option — 425 g lighter than the Sea to Summit Spark Pro Down Sleeping Bag (56% less weight). If grams matter to you, that is the one to beat.
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Spec Nemo Tensor Ultralight Sea to Summit Spark Pro Down Sleeping Bag
Weight 340 g · 0.340 kg · 0.75 lb 765 g · 0.765 kg · 1.69 lb
Brand Nemo Sea to Summit
Category Sleep System Sleep System
Nemo Tensor Ultralight
340 g

Ultralight inflatable pad with minimal noise. R-value 3.5.

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Sea to Summit Spark Pro Down Sleeping Bag
765 g

Ultralight down sleeping bag at 765g with 900+ fillpower RDS-certified down, 15°F rating and Free-Flow Zip system for versatility.

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Nemo Tensor Ultralight vs Sea to Summit Spark Pro Down Sleeping Bag: which should you buy?

If saving weight is your priority, the Nemo Tensor Ultralight wins — at 340 g it is 425 g (56%) lighter than the Sea to Summit Spark Pro Down Sleeping Bag (765 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.

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